FR2658043A1 - SEAT BELT CLOSURE WITH IMPACT SAFETY DEVICE. - Google Patents

Abstract

Seat belt fastener for receiving and locking an insertion tab (15) with a housing (17) and, located therein, an insertion path for the insertion tab (15). ), containing an ejector (16), subjected to the action of a spring, with a latch (18) mounted in the closure (10) and cooperating with the tongue recess in the event of locking, which lock holds the tongue insertion (15) in an associated recess of the closure (10) and with a sliding button (20), subjected to the action of a spring, guided transversely to the plane of movement of the latch (18), with a view to the removal of the lock, a locking element (22) which fixes and locks the lock (10) in the locking position of the closure, being movably mounted in the housing (17) and being movable, by the sliding button, in a position releasing the lock (18), with a view to unlocking the closure (10).

Description

Seat belt closure with safety device against

  The present invention relates to a seat belt closure intended to receive and lock an insertion tab with a housing and, located inside the latter, a path for introducing the insertion tongue, containing an ejector subjected to the action of a spring with a latch mounted in the closure and cooperating with the tongue recess in the event of locking, which latch holds the insertion tongue in an associated recess of the closure, and with a sliding button, subjected to the action of a spring, guided transversely to the plane of movement of the lock, for the purpose of removing the lock, a blocking element which fixes and blocks the lock in the position for locking the closure, being mounted movable in the housing and can be moved by the sliding button

  in a position releasing the lock, for unlocking-

closing age.

  A seat belt closure of this type is described in document DE-OS 27 19 325 In this known closure, the lock, mounted with a tendency to open by itself in the closure housing, is

  locked in its position locking the insertion tab

  tion, by a locking element, sliding in the same plane and in the same direction as the sliding button When unlocking the closure, the sliding button with the associated stops, first of all pushes the locking element in a releasing position the bolt, so that it jumps and releases the insertion tab,

  simultaneously unlocking the closure.

  This closure of the aforementioned type has the drawback of not being protected against the acceleration forces, manifested in the form of shocks in the plane of movement of the sliding boutoft, such as those which occur, for example, when the closure is moved in its longitudinal direction, in the frame

  seat belt tension in the event of an accident.

  If during a tension displacement of this type, the closure is suddenly braked at the end of the tension displacement, the sliding button continues its displacement in the direction of the tension, due to its own kinetic energy which causes the sliding button and the closing body carry out a relative movement with respect to each other, during which the sliding button is introduced into the closing and thus displaces the locking element in the position releasing the lock. a displacement of tension, acting on a closure of the aforementioned type, an automatic opening of the closure

is therefore not excluded.

  The invention therefore proposes to improve a seat belt closure of the aforementioned type,

  so that it is protected from accelerating forces

  tion, acting in the direction of action of the sliding button.

  This object is achieved according to the invention by the fact that there is provided, between the sliding button and the locking element, a movable compensation mass which bears against a spring, acting on the

  blocking in its blocking position.

  Document DE-OS 35 33 684 already describes an impact safety device for a seat belt closure, in which the acceleration and mass forces, acting on the sliding button, are already compensated by a compensation mass additional, but the construction of this closure as well as the provision of the additional mass are complex and expensive; moreover, the compensation mass acts

  basically on the slide button itself.

  The present invention contradicts this advantage, with a simple construction of the closure, that the blocking element, subjected to the action of the sliding button in the event of impacts, but itself also stressed at the same time, by forces of acceleration and mass, is locked against its displacement in the position releasing the latch, which means that there is no displacement of the blocking element in the position releasing the latch, despite an increasing introduction of the sliding button and on the contrary, in the event of shocks, the insertion displacement

  of the sliding button is recovered by the locking element.

  According to a preferred embodiment of the invention, the spring acting on the blocking element is constituted by a leaf spring, connected to the ends of the rod-shaped blocking element, which spring is prestressed, on the sliding button side. , around a stop integral with the housing, so that the element of

  blockage is pulled or held by the leaf spring.

  To produce this prestress and to cooperate with the compensation mass, the leaf spring is curved around a stop integral with the housing, arranged on the side of the sliding button, the compensation mass bearing against the leaf spring, by a bar. acting on it There are advantageously provided two stops spaced from one another, in the transverse direction of closure, the bar of the compensating mass acting on the leaf spring, between

these stops.

  To form an easily functioning closing kinematics, the connection between the leaf spring and the locking element is ensured by an elongated hole in which the ends of the leaf spring move.

  relative to the blocking element.

  According to a preferred embodiment of the invention, the sliding button, the compensation mass and the blocking element are located in the same closing plane, parallel to the plane of introduction of the insertion tab. In this case, the respective supporting elements

  can be combined in a simple way.

  However, provision is also made to arrange the various aforementioned ends in closure planes different from the plane of introduction of the insertion tongue; in this case, the supporting elements must be arranged between the sliding button, the compensation mass and the blocking element, always obliquely

  relative to the longitudinal axis of the closure.

  According to an exemplary embodiment of the invention, it is provided that the sliding button spring bears directly against the compensation mass, in which case the compensation mass, placed between the sliding button spring and the spring acting on the element of

  blocking, exerts no force, especially in the event of action-

  Normally normal closure It is possible, as a variant, to provide that, to support the sliding button spring, a protruding part is formed, integral with the housing, which serves as a support for the compensation mass, subjected to the action of the leaf spring In this embodiment, any oscillations occurring in the system constituted by the sliding button, the compensation mass and the blocking element are eliminated. Finally, the invention is not limited to locks in which the lock tends to open on its own; since the invention does not primarily concern the locking mechanism of the lock, it also extends to forms of construction in which the sliding button itself ensures active movement of the lock, after passage of the element blocking in its position

releasing the lock.

  Examples of embodiments of the invention are described below, in more detail, with reference to the accompanying drawings in which: FIG. 1 is a view in partial longitudinal section of a seat belt closure, FIGS. 2 a to 2 c represent, in a schematic view of the closure, the states of displacement without accelerations, FIGS. 3 a and 3 b represent the closure, in a view according to FIGS. 2 a to 2 c, in the event of acceleration forces, Figures 4 a to 4 c show another embodiment of the closure, according to the view of Figures 2 a to 2 c, Figures 5 a and 5 b show the closure, in a view according to Figures 4 a to 4 c , in case of acceleration forces. A seat belt closure 10 consists of a one-piece lock plate 11 which is bent in the region of its attachment to an anchor piece 12 in two branches 13, 14 of the same length, between which can be inserted an insertion tongue 15, against the action of an ejector 16 The closure has two side walls 17 which give the closure a U-shape; in the rear region, a lock 18 is rotatably mounted, in a

  articulation 19, in the side walls 17, perpen-

  particularly at the insertion plane of the insertion tongue 15 The latch 18 is blocked by a blocking element 22 placed sliding in the side walls 17 of the closure 10, in the same direction as the sliding button 20 In its blocking position , located in the direction of the sliding button 20, the blocking element 22 rests on a protruding part of the lock 18 and protects the latter against an opening During the unlocking movement, the sliding button 20 with its stops 32 acts on the blocking element 22, guided for example in elongated holes 33 made in the side walls 17 and displaces the latter in a position releasing the lock

  18 The detailed construction of this locking mechanism

  However, this is not the subject of the invention.

  As can be seen more clearly from FIGS. 2 a to 2 c, the sliding button 20 has roughly the shape of a U; at the two outer ends of its branches 21 are placed the stops 32 intended to move the locking element 22; at the same time, the sliding button 20 is fixed here, in its direction of extraction, on the closure housing 17, so that the extraction movement

  sliding button 20 is limited.

  A compensation mass 23 against which the sliding button spring 24 is placed, placed between the sliding button 20 and the compensation mass 23, is

  movable ascent between the arms 21 of the sliding button

  sant 20 On the side of the compensation mass 23, opposite the sliding button 20, a leaf spring 25 is folded around two stops 26, integral with the housing, spaced from one another in the transverse direction of closure By its ends, this spring is fixed on the blocking element 22, so that a prestressing of the leaf spring 25 causes an action on the element of

  blocking 22, in its front position, releasing the lock 18.

  The connection between the end branches of the leaf spring and the rod-shaped blocking element 22 is provided by an elongated hole 27 made in the branches of the leaf spring 25 which makes it possible to move

  relative of the locking element 22 and of the leaf spring 25.

  The stops 26 are spaced from each other; the compensation mass 23 bears against the leaf spring 25, by a bar 28 which is associated with it and which acts on the leaf spring 25, in the middle of the distance

separating the stops 26.

  The normal movement of the elements of the seat belt closure, that is to say without acceleration or mass forces acting upon the tensioning demand of the closure, is described in

reference to FIGS. 2 a to 2 c.

  Figure 2a shows the locked state of the closure, with inserted insertion tab In this case, the locking element 22 is located in its front position, formed in the elongated hole 33 of the side walls 17 on the latch 18 not visible in this figure At the same time, the sliding button 20 is also in its front, extraction position, in which it is fixed against the housing, by the end stops. The sliding button spring 24 as well as the leaf spring 25 thus exerts a force holding the locking element 22 in its locking position, the compensating mass, located between the two springs 24, 25, acting as a

  transmission, without other forces starting from it.

  If, according to FIG. 2b, the closure opens by introduction of the sliding button 20 in the direction of the arrow 34, the latter comes into contact, by its branches 21 and the stops 32 which are formed at this location, with the locking element 22 and moves the latter into its rear disengaging position In doing so, the sliding button spring 24 is tensioned and the compensating mass 23 is slightly moved forward, until they balance the forces of the springs 24 and 25 Due to the displacement of the locking element 22 in its disengaged position, there is, at the same time, a tension of the

  leaf spring 25 Once again, no additional force

  silence is exercised by the compensation mass 23.

  FIG. 2 c represents the unlocked state of the closure 10, in which the sliding button 20 again takes its front position, in which it is held by the stops integral with the housing. The sliding button spring 24 is relaxed, however the leaf spring 25

  is still tense because, in the case of an open closure

  rusty with ejected insertion tab, the locking element 22 is held in its release position, so that, when the insertion tab is re-inserted, the latch 18 can act first and the blocking element 22 can again take its

blocking position.

  The operation of the impact safety device is described below with reference to FIGS. 3 a and 3 b. FIG. 3 a first shows the state of movement of the closure 10, in which the closure is moved in the direction of arrow 29 in

  if the seat belt is tensioned

  dante or anchor piece 12 During this move-

  tensioning force, an acceleration force is exerted in the direction of arrow 30, for a seat belt closure locked according to the view in FIG. 2 a In this position, there is no relative displacement between the closure or the sliding button 20, the compensating mass 23 and the locking element 25, because all the components are held in the closure housing, by

concordance of form.

  FIG. 3 b represents the state of displacement, at the end of the tensioning operation, in which the closing body 10 is strongly braked, so that the sliding button 20 tends to execute an insertion movement in the closure, in the direction of arrow 34 in FIG. 2 b, which is equivalent to an unlocking movement of the closure During this movement, not only the sliding button 20 is introduced into the closure body, under the tension of the spring sliding button 24, but there is also a displacement of the compensation mass 23, in the same direction as the sliding button; due to its support on the leaf spring 25, by means of the bar 28, the compensating mass also ensures an additional tension of the leaf spring 25 But since by its tension, the leaf spring acts on the blocking element 22, in its bolt blocking position 18, an increase in the tension of the leaf spring leads to an increase in the force holding the blocking element 22 in its blocking position, which means that, despite the introduction of the sliding button 20 with the arrival of its stops 32 on the blocking element 22, the latter is held in the position blocking the latch From the blocking element 22 a movement is maintained to maintain the movement of introduction of the

sliding button 20.

  It is obvious that the dimensioning of the compensating mass 23 as well as the forces of the springs

  24 and 25 must be such that the equilibrium state described above

  above is reached in the event of impact In this case, the safety against impact of the seat belt closure

described is therefore effective.

  Figures 4 a to 4 c as well as 5 a and 5 b

  represent, in accordance with the description given in

  reference to the exemplary embodiment of FIGS. 2 and 3, an embodiment of the invention in which the sliding button spring 24 bears, not against the compensating mass 23, but against a projecting part 36 integral with the housing ; this projecting part 36 serves at the same time as a support for the compensating mass 23 which is pressed against the projecting part 36, by the pre-stressed leaf spring 25 During movement, the projecting part 36 also recovers the return movement of the mass compensation 23, from its position shown in FIG. 5 b, in the position visible on

Figure 5 a.

  For the rest, the same elements of Figures 4 and 5 have the same references as in Figures 2 and 3; with regard to operation, there are also no differences between the exemplary embodiments,

  so it is referred to the detailed description made

  with reference to FIGS. 2 a to 2 c as well as 3 a and 3 b, with this characteristic that the respective support of the spring of

  sliding button 24, on the one hand and the compensating mass

  tion 23, under the action of the spring 25, on the other hand, takes place against the projecting part 36 integral with the

housing.

Claims (7)

  1 Seat belt closure intended to receive and lock an insertion tongue (15) with a housing (17) and, located inside thereof, an insertion path for the insertion tongue ( 15) containing an ejector (16), subjected to the action of a spring, with a latch (18) mounted in the closure (10) and cooperating with the tongue recess in the event of locking, which latch holds the tongue insertion (15) in an associated recess of the closure (10) and with a sliding button (20), subjected to the action of a spring, guided transversely to the plane of movement of the latch (18), in order to the removal of the locking, a blocking element (22) which fixes and blocks the latch (10) in the locking position of the closure, being movably mounted in the housing (17) and capable of being moved, by the sliding button, in a position releasing the lock (18), for unlocking the closure (10), characterized in that there is provided, between the sliding button (20) and the locking element (22), a movable compensation mass (23) which bears against a spring (25), acting on the blocking (22) in its blocking position.   2 closure according to claim 1, characterized in that the spring (25), acting on the blocking element (22), is a leaf spring (25) connected to the ends of the rod-shaped blocking element, which spring is prestressed, sliding button side,   around a stop (26) integral with the housing.   3 Closure according to claim 2,   characterized in that it is provided for the spring (25).   two stops (26), spaced from each other in the transverse direction of closure and in that the compensation mass (23) bears against the spring (25), by a bar (28), acting between the stops 1 l (26).   4 Closure according to any one of   claims 1 to 3 characterized in that the connection   between the leaf spring (25) and the locking element (22) is formed by an elongated hole (27) made in the spring (25), housing the ends of the element blocking (22).   Closure according to any of   claims 1 to 4, characterized in that the button   sliding (20), the compensating mass (23) and the locking element (22) are located in the same closing plane,   parallel to the insertion plane of the insertion tab tion (15).   6 Closure according to any one of   claims 1 to 4, characterized in that the button   sliding (20) the compensating mass (23) and the locking element (22) are located in closing planes   different from the insertion plane of the insertion tab tion (15).   7 Closure according to any one of   claims 1 to 6 characterized in that the spring of   sliding button (24) bears directly against the compensation mass (23).   8 Closure according to any one of   claims 1 to 6, characterized in that to support   the sliding button spring (24), a protruding part (36) is formed, integral with the housing, which serves as a support for the compensation mass (23), subjected to the action leaf spring (25).